How did the fortune-telling method come about?

Counting on fingers, also called Ziping, also called Four-Pillar Life Theory, was invented by a man named Xu Ziping in the Song Dynasty. The representative work of this technique is Yuan Hai Zi Ping, whose predecessor is Shou Xin written by Li in Tang Dynasty.

According to the classification of ancient books in China, this kind of books belongs to the "partial technical category"

The Book of Changes belongs to the "Classic Department" and is called "the head of the group classics", so it should be said that these two books are by no means the same.

There are many contents in Zhouyi, which can be called all-encompassing, and divination is only one aspect of its content. And it is a less important side.

As for the relationship between the two, its basic theory is all used in the theory of yin-yang and five elements, which is a bit marginal, but that's all.

So my opinion is that there is really no substantive relationship between the fortune-telling of fans and Zhouyi.